
W78C438C Data Sheet
8-BIT MICROCONTROLLER
Publication Release Date: December 4, 2006
- 1 -
Revision A6
Table of Contents-
1.
2.
3.
4.
5.
GENERAL DESCRIPTION ......................................................................................................... 2
FEATURES................................................................................................................................. 2
PIN CONFIGURATIONS ............................................................................................................ 3
PIN DESCRIPTION..................................................................................................................... 5
FUNCTIONAL DESCRIPTION ................................................................................................... 7
5.1
Dedicated Data and Address Port.................................................................................. 7
5.2
Additional I/O Port........................................................................................................... 9
5.3
Additional External Interrupt ........................................................................................... 9
5.4
Newly Added Special Function Registers .................................................................... 11
5.5
Power Reduction Function ........................................................................................... 11
5.6
Programming Difference............................................................................................... 12
ELECRICAL CHARACTERISTICS........................................................................................... 13
6.1
Absolute Maximum Ratings.......................................................................................... 13
6.2
D.C. Characteristics...................................................................................................... 13
6.3
A.C. Characteristics...................................................................................................... 14
6.3.1
Clock Input Waveform....................................................................................................14
6.3.2
Program Fetch Cycle......................................................................................................14
6.3.3
Data Memory Read/Write Cycle.....................................................................................15
TIMING WAVEFORMS............................................................................................................. 16
7.1
Program Fetch Cycle.................................................................................................... 16
7.2
Data Memory Read/Write Cycle................................................................................... 17
TYPICAL APPLICATION CIRCUITS........................................................................................ 18
8.1
Using 128K
×
8 bit External EPROM (W27E010) ........................................................ 18
PACKAGE DIMENSIONS......................................................................................................... 20
9.1
84-pin PLCC ................................................................................................................. 20
9.2
100-pin QFP.................................................................................................................. 21
REVISION HISTORY................................................................................................................ 22
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